﻿using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Data;

namespace MoneyBook.Windows.Data {
    public class NullableConverter : IValueConverter {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
            if (targetType.GetGenericTypeDefinition() != typeof(Nullable<>)) {
                return value;
            }
            if (!(value is string)) {
                return value;
            }
            if (!string.IsNullOrEmpty((string)value)) {
                return value;
            }

            return null;
        }
    }
}
